CHASE
A continuous recess or enclosure built into a wall to receive pipes, wiring, ducts, etc. Also, to decorate metalwork by tooling or engraving the surface.
A continuous recess or enclosure built into a wall to receive pipes, wiring, ducts, etc. Also, to decorate metalwork by tooling or engraving the surface.
Cracks in timber due to uneven seasoning; also a series of fine map cracks in painted and transparent finishes.
See DRY SPONGE.
A respirator that uses a chemical cartridge to purify inhaled air of certain gases and vapours. This type respirator is effective for concentrations no more than ten times the TLV of the contaminant, if the contaminant was greater than this, then an alternative respirator system would be advised
A group of single elements or compounds with a common general name. For example: acetone, methyl ethyl ketone (MEK), and methyl isobutyl ketone (MIBK) are of the _ketone_ family.
A chronic physical response induced by certain substances, involving discomfort, loss of function or other allergic symptoms.
The arrangement within the molecule of atoms and their chemical bonds.
1. A chemical used to kill micro organisms including spores. 2. A pesticide used to interfere with the reproductive cycle on a target organism.
A compound of chlorine with another element or group; a salt of hydrochloric acid.
A principal member of a timber or steel roof truss which extends from one end to the other, primarily to resist bending.